Can I start from a different number?

Yes. Use the Start From field to begin at any integer - useful for continuing from an existing file.

What does Auto padding do?

Aligns all line numbers to the width of the largest number so text lines up neatly.

Dot (.), colon (:), pipe (|), or plain space between the line number and text.

Yes. Every line gets a number, including empty ones, so the output lines up with the gutter in an editor.

Up to one billion. Values below zero are clamped to 0, and clearing the field or typing a lone minus sign falls back to 1 instead of producing NaN.

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Can I start from a different number?: Yes. Use the Start From field to begin at any integer - useful for continuing from an existing file.
What does Auto padding do?: Aligns all line numbers to the width of the largest number so text lines up neatly.
Supported separators?: Dot (.), colon (:), pipe (|), or plain space between the line number and text.
Are blank lines numbered too?: Yes. Every line gets a number, including empty ones, so the output lines up with the gutter in an editor.
How large can the starting number be?: Up to one billion. Values below zero are clamped to 0, and clearing the field or typing a lone minus sign falls back to 1 instead of producing NaN.